libschroedingerenc.c

ffmpeg移植到symbian的全部源代码

static SchroFrame *libschroedinger_frame_from_data (AVCodecContext *avccontext,
                                                    void *in_data)
{
    FfmpegSchroEncoderParams* p_schro_params = avccontext->priv_data;
    SchroFrame *in_frame;
    /* Input line size may differ from what the codec supports. Especially
     * when transcoding from one format to another. So use avpicture_layout
     * to copy the frame. */
    in_frame = schro_frame_new_and_alloc (NULL,
                                          p_schro_params->frame_format,
                                          p_schro_params->format->width,
                                          p_schro_params->format->height);

    avpicture_layout ((AVPicture *)in_data, avccontext->pix_fmt,
                      avccontext->width, avccontext->height,
                      in_frame->components[0].data,
                      p_schro_params->frame_size);

    return in_frame;
}

static void SchroedingerFreeFrame(void *data)
{
    FfmpegDiracSchroEncodedFrame *enc_frame = data;

    av_freep (&(enc_frame->p_encbuf));
    av_free(enc_frame);
}

static int libschroedinger_encode_frame(AVCodecContext *avccontext,
                                        unsigned char *frame,
                                        int buf_size, void *data)
{
    int enc_size = 0;
    FfmpegSchroEncoderParams* p_schro_params = avccontext->priv_data;
    SchroEncoder *encoder = p_schro_params->encoder;
    struct FfmpegDiracSchroEncodedFrame* p_frame_output = NULL;
    int go = 1;
    SchroBuffer *enc_buf;
    int presentation_frame;
    int parse_code;
    int last_frame_in_sequence = 0;

    if(data == NULL) {
        /* Push end of sequence if not already signalled. */
        if (!p_schro_params->eos_signalled) {
            schro_encoder_end_of_stream(encoder);
            p_schro_params->eos_signalled = 1;
        }
    } else {
        /* Allocate frame data to schro input buffer. */
        SchroFrame *in_frame = libschroedinger_frame_from_data (avccontext,
                                                                data);
        /* Load next frame. */
        schro_encoder_push_frame(encoder, in_frame);
    }

    if (p_schro_params->eos_pulled)
        go = 0;

    /* Now check to see if we have any output from the encoder. */
    while (go) {
        SchroStateEnum  state;
        state = schro_encoder_wait(encoder);
        switch (state)
        {
        case SCHRO_STATE_HAVE_BUFFER:
        case SCHRO_STATE_END_OF_STREAM:
            enc_buf = schro_encoder_pull (encoder,
                                          &presentation_frame);
            assert (enc_buf->length > 0);
            assert (enc_buf->length <= buf_size);
            parse_code = enc_buf->data[4];

            /* All non-frame data is prepended to actual frame data to
             * be able to set the pts correctly. So we don't write data
             * to the frame output queue until we actually have a frame
             */
             p_schro_params->enc_buf = av_realloc (
                                p_schro_params->enc_buf,
                                p_schro_params->enc_buf_size + enc_buf->length
                                );

            memcpy(p_schro_params->enc_buf+p_schro_params->enc_buf_size,
                   enc_buf->data, enc_buf->length);
            p_schro_params->enc_buf_size += enc_buf->length;


            if (state == SCHRO_STATE_END_OF_STREAM) {
                p_schro_params->eos_pulled = 1;
                go = 0;
            }

            if (!SCHRO_PARSE_CODE_IS_PICTURE(parse_code)) {
                schro_buffer_unref (enc_buf);
                break;
            }

            /* Create output frame. */
            p_frame_output = av_mallocz(sizeof(FfmpegDiracSchroEncodedFrame));
            /* Set output data. */
            p_frame_output->size     = p_schro_params->enc_buf_size;
            p_frame_output->p_encbuf = p_schro_params->enc_buf;
            if (SCHRO_PARSE_CODE_IS_INTRA(parse_code) &&
                SCHRO_PARSE_CODE_IS_REFERENCE(parse_code)) {
                p_frame_output->key_frame = 1;
            }

            /* Parse the coded frame number from the bitstream. Bytes 14
             * through 17 represesent the frame number. */
                p_frame_output->frame_num = (enc_buf->data[13] << 24) +
                                            (enc_buf->data[14] << 16) +
                                            (enc_buf->data[15] <<  8) +
                                             enc_buf->data[16];

            ff_dirac_schro_queue_push_back (&p_schro_params->enc_frame_queue,
                                            p_frame_output);
            p_schro_params->enc_buf_size = 0;
            p_schro_params->enc_buf      = NULL;

            schro_buffer_unref (enc_buf);

            break;

        case SCHRO_STATE_NEED_FRAME:
            go = 0;
            break;

        case SCHRO_STATE_AGAIN:
            break;

        default:
            av_log(avccontext, AV_LOG_ERROR, "Unknown Schro Encoder state\n");
            return -1;
        }
    }

    /* Copy 'next' frame in queue. */

    if (p_schro_params->enc_frame_queue.size == 1 &&
        p_schro_params->eos_pulled)
        last_frame_in_sequence = 1;

    p_frame_output =
               ff_dirac_schro_queue_pop (&p_schro_params->enc_frame_queue);

    if (p_frame_output == NULL)
        return 0;

    memcpy(frame, p_frame_output->p_encbuf, p_frame_output->size);
    avccontext->coded_frame->key_frame = p_frame_output->key_frame;
    /* Use the frame number of the encoded frame as the pts. It is OK to
     * do so since Dirac is a constant frame rate codec. It expects input
     * to be of constant frame rate. */
    avccontext->coded_frame->pts = p_frame_output->frame_num;
    enc_size = p_frame_output->size;

    /* Append the end of sequence information to the last frame in the
     * sequence. */
    if (last_frame_in_sequence && p_schro_params->enc_buf_size > 0)
    {
        memcpy (frame + enc_size, p_schro_params->enc_buf,
                p_schro_params->enc_buf_size);
        enc_size += p_schro_params->enc_buf_size;
        av_freep (&p_schro_params->enc_buf);
        p_schro_params->enc_buf_size = 0;
    }

    /* free frame */
    SchroedingerFreeFrame (p_frame_output);

    return enc_size;
}


static int libschroedinger_encode_close(AVCodecContext *avccontext)
{

    FfmpegSchroEncoderParams* p_schro_params = avccontext->priv_data;

     /* Close the encoder. */
    schro_encoder_free(p_schro_params->encoder);

    /* Free data in the output frame queue. */
    ff_dirac_schro_queue_free (&p_schro_params->enc_frame_queue,
                               SchroedingerFreeFrame);


    /* Free the encoder buffer. */
    if (p_schro_params->enc_buf_size)
        av_freep(&p_schro_params->enc_buf);

    /* Free the video format structure. */
    av_freep(&p_schro_params->format);

    return 0 ;
}


AVCodec libschroedinger_encoder = {
    "libschroedinger",
    CODEC_TYPE_VIDEO,
    CODEC_ID_DIRAC,
    sizeof(FfmpegSchroEncoderParams),
    libschroedinger_encode_init,
    libschroedinger_encode_frame,
    libschroedinger_encode_close,
#ifdef __CW32__
    0,
    CODEC_CAP_DELAY,
    0,
    0,
    0,
    (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_YUV444P, PIX_FMT_NONE},
    NULL_IF_CONFIG_SMALL("libschroedinger Dirac 2.2"),
#else
    .capabilities= CODEC_CAP_DELAY,
    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_YUV444P, PIX_FMT_NONE},
    .long_name= NULL_IF_CONFIG_SMALL("libschroedinger Dirac 2.2"),
#endif
};